Front-to-back sharpness for a 20 mm lens on APS-C (Nikon, Sony, Fujifilm, Pentax): focus at the hyperfocal distance and everything from half that distance to infinity is acceptably sharp.
The chart lists every aperture in meters and feet; the calculator above it is preset to these values so you can try other settings.
Hyperfocal distance chart: 20 mm on APS-C (Nikon, Sony, Fujifilm, Pentax)
| Aperture | Hyperfocal (m) | Hyperfocal (ft) | Sharp from (m) | Sharp from (ft) |
|---|---|---|---|---|
| f/1.4 | 14.31 m | 46.9 ft | 7.15 m | 23.5 ft |
| f/1.8 | 11.13 m | 36.5 ft | 5.57 m | 18.3 ft |
| f/2 | 10.02 m | 32.9 ft | 5.01 m | 16.4 ft |
| f/2.8 | 7.16 m | 23.5 ft | 3.58 m | 11.8 ft |
| f/4 | 5.02 m | 16.5 ft | 2.51 m | 8.2 ft |
| f/5.6 | 3.59 m | 11.8 ft | 1.80 m | 5.9 ft |
| f/8 | 2.52 m | 8.3 ft | 1.26 m | 4.1 ft |
| f/11 | 1.84 m | 6.0 ft | 0.92 m | 3.0 ft |
| f/16 | 1.27 m | 4.2 ft | 0.64 m | 2.1 ft |
| f/22 | 0.93 m | 3.0 ft | 0.46 m | 1.5 ft |
Circle of confusion 0.02 mm. A 20 mm lens on this sensor frames like 31 mm on full frame.
Other focal lengths
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